Service manual

21
6-2. Vertical
Unstable or
Abnormal picture
Is
– 13V DC line
correct?
Check PWR – 13V
ambient circuit.
No
Yes
Is
the output
waveform of IC401
(pin 5) normal?
Trouble in V.Sync line
or IC501 failure.
Yes
No
45Vp-p
Is the
output pulse
of IC501 (pin 4)
normal?
Yes
No
Check V.DY
and ambient circuit.
Check the IC401
or ambient circuit.